Apparatus for recording and limiting torque

Details Apparatus for recording and limiting torque Apparatus for recording and limiting torque

1980-03-18

1981-12-15

Mackey, Robert

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

7386223, 81470, 91 59, B25B 2314

Patent

active

043054722

ABSTRACT:
Apparatus for recording and limiting the torque applied to a pipe by a set of power tongs, wherein the tongs are operated by a hydraulic fluid pumped through a feed line to a hydraulic motor in the tongs and then returned by a return line. The apparatus includes a hydraulic tension cell attached between the tongs and a fixed attachment whereby torque applied by the tongs causes hydraulic pressure in the tension cell proportional to the torque applied. The tension cell is hydraulically connected to a helical pressure sensor tube. An operating arm is attached to the pressure sensor tube such that hydraulic pressure in the hydraulic tension cell causes the operating arm to rotate in an amount proportional to the pressure and therefore the torque. The operating arm is cammingly engaged with a spring arm which in turn is engaged with an air valve. The closure of the air valve causes the opening of a shunting valve between the feed line and return line, which shunts fluid between the lines, thereby bypassing the motor and limiting the torque.

REFERENCES:
patent: 3097551 (1963-07-01), Schmitt
patent: 3693727 (1972-09-01), Bell
patent: 3719236 (1973-03-01), Smith, Jr. et al.
patent: 3719237 (1973-03-01), Flick
patent: 3745820 (1973-07-01), Weiner
patent: 4199032 (1980-04-01), Weiner et al.

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